<template>
    <div class="app-container">

        <div>
            <FilenameOption v-model="filename" />
            <AutoWidthOption v-model="autoWidth" />
            <BookTypeOption v-model="bookType" />
            <el-button :loading="downloadLoading" style="margin:0 0 20px 20px;" type="primary" icon="el-icon-document" @click="handleDownload">
                Export Excel
            </el-button>
            <a href="https://panjiachen.github.io/vue-element-admin-site/feature/component/excel.html" target="_blank" style="margin-left:15px;">
                <el-tag type="info">Documentation</el-tag>
            </a>
        </div>

        <el-table v-loading="listLoading" :data="list" element-loading-text="Loading..." border fit highlight-current-row>
            <el-table-column align="center" label="Id" width="95">
                <template slot-scope="scope">
                    {{ scope.$index }}
                </template>
            </el-table-column>
            <el-table-column label="Title">
                <template slot-scope="scope">
                    {{ scope.row.title }}
                </template>
            </el-table-column>
            <el-table-column label="Author" width="110" align="center">
                <template slot-scope="scope">
                    <el-tag>{{ scope.row.author }}</el-tag>
                </template>
            </el-table-column>
            <el-table-column label="Readings" width="115" align="center">
                <template slot-scope="scope">
                    {{ scope.row.pageviews }}
                </template>
            </el-table-column>
            <el-table-column align="center" label="Date" width="220">
                <template slot-scope="scope">
                    <i class="el-icon-time" />
                    <span>{{ scope.row.timestamp | parseTime('{y}-{m}-{d} {h}:{i}') }}</span>
                </template>
            </el-table-column>
        </el-table>
    </div>
</template>

<script>
import { fetchList } from "@/api/article";
import { parseTime } from "@/utils";
// options components
import FilenameOption from "./components/FilenameOption";
import AutoWidthOption from "./components/AutoWidthOption";
import BookTypeOption from "./components/BookTypeOption";

export default {
    name: "ExportExcel",
    components: { FilenameOption, AutoWidthOption, BookTypeOption },
    data() {
        return {
            list: null,
            listLoading: true,
            downloadLoading: false,
            filename: "",
            autoWidth: true,
            bookType: "xlsx"
        };
    },
    created() {
        this.fetchData();
    },
    methods: {
        fetchData() {
            this.listLoading = true;
            fetchList().then(response => {
                this.list = response.data.items;
                this.listLoading = false;
            });
        },
        handleDownload() {
            this.downloadLoading = true;
            import("@/vendor/Export2Excel").then(excel => {
                const tHeader = ["Id", "Title", "Author", "Readings", "Date"];
                const filterVal = ["id", "title", "author", "pageviews", "display_time"];
                const list = this.list;
                const data = this.formatJson(filterVal, list);
                excel.export_json_to_excel({
                    header: tHeader,
                    data,
                    filename: this.filename,
                    autoWidth: this.autoWidth,
                    bookType: this.bookType
                });
                this.downloadLoading = false;
            });
        },
        formatJson(filterVal, jsonData) {
            return jsonData.map(v => filterVal.map(j => {
                if (j === "timestamp") {
                    return parseTime(v[j]);
                } else {
                    return v[j];
                }
            }));
        }
    }
};
</script>

<style>
.radio-label {
  font-size: 14px;
  color: #606266;
  line-height: 40px;
  padding: 0 12px 0 30px;
}
</style>
